The answer is yes.
Check out the recent documentary, “Ghenghis Blues,” for a demonstration of what is called Tuvan singing or throatsinging. It is also possible to find recordings of this technique on CD.
Or just look for the dcumentary on Feynmann’s last few months, where he was wanting to go to Russia. Taught himself how to throat sing, as an excuse to go to that area. (He wanted to visit the geographic center of Asia.) If that is ‘Ghengis Blues’, my appologies, I don’t know the name of the documentary.
And of course, you have Agnes Nitt who sang in harmony with herself. 
>>Being Chaotic Evil means never having to say your sorry…unless the other guy is bigger than you.<<
—The dragon observes
Please add a link to the column you are discussing. Thanks.
Jill